Ujjwal Kumar DebKittisak ChayantrakomYongwimon LenburyMahidol University2018-06-112018-06-112012-12-01International Journal of Mathematics and Computers in Simulation. Vol.6, No.5 (2012), 496-503199801592-s2.0-84875730612https://repository.li.mahidol.ac.th/handle/20.500.14594/14008This paper aims to show dynamic behavior of microalgae suspension in a Horizontal Loop Tubular Photobioreactor (HLTP). Two models of a single-phase flow and a two-phase flow have been proposed taking into account the light irradiance. The governing equations describing a single-phase flow are the continuity equation and the Navier-Stokes equation. The viscosity of the microalgae suspension is a function of microalgae cell concentration which varies in time. Using the governing equations of a single-phase flow together with the Cahn-Hiliard mass conservation equation, we can describe the dynamic behavior of a two-phase flow. The results obtained from both models are compared. It is noted that both results are significantly different. In the two-phase flow model, the mass transfer rate and the shear rate are higher than those obtained from the single-phase model.Mahidol UniversityComputer ScienceMathematicsArticleSCOPUS